Steam-boiler furnace.



F C. STIMMEL.

STEAM BOILER FURNACE.

APPLICATION FILED 0:013. 1913.

1,21 1,782. Patented Jan. 9,1917.

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-F. C. STIMMEL.

STEAM BOILER FURNACE.

' APPLICATION nuzn DEC. 13. 1913.

Patented Jan. 9, 1917.

M Zia 477%)? F. C. STIMMEL.

STEAM BOILER FURNACE,

APPLICATION FILED DEC. 13. I913.

1,21 1,782. Patented Jan. 9,1917.

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fun w rmsrrnn s'rarEs rarE- r o Ero FREDERICK o. STIMMEL; 0F CHATTANOOGA, TENEEssEE', AssIGNoE To TEE onsEY- HEDGES 00., or .CHATTANOOGA, TENNESSEE.

STEAM-BOILER FURNACE.

Specification of Letters Patent.

Patented; Jan. 9, 1917.

Application filed December 13, 1913. Serial No. 806,449.

at Chattanooga, in the county of Hamilton andyState of Tennessee, have invented a new and useful Improvement in Steam-Boiler Furnaces, of which the following is a specitio This invention relates more particularly to the construction of metal jacketed casings or settings for steam boiler furnaces. It is especially applicable to the Dutch oventype of boiler furnaces which are used for burning refuse fuels, such assaw-dust, bagasse and the like, that produce a large quantity of sparks. r a I a The object of the invention is to produce a strong, rigid and durable casing for steam boiler furnaces which, by reason of its novel formation, is entirely self-supporting independently of the boiler-supporting side columns or other usual supports, and which, at the same time, provides a taper drop back combustion chamber that affords ample room for the complete combustionof the gases, and sheds or arrests the ashes and sparks, preventing them from being drawn into the boiler flues bythe draft. a To this end the lower portion of thecasing beneath the boiler is of truss-like or arch-like formation with end supporting portions, so that no columns, jacks or other supports are required to sustain the weight of the casing intermediate of its end supports. This formation also produces ajc'ombustion chamber having a bottom portion which drops or inclines downwardly toward the rear, whereby the expansion of the gases neces sary to proper combustion is permitted and the ashes and sparks are shed into a receiving chamber at the rear end of thecasing and prevented from being drawn. into the boiler fiues. r j

In the accompanying drawings; 7 v Figure l is a side elevation of a steam boiler furnace having a casing embodying the invention. Fig. 2 is a longitudinal sectional elevation thereof. Fig. 3 is a transverse sectional elevation thereof in line 33, Fig. 2, looking toward the rear. Fig. 4 is a transverse sectional elevation. thereof in line l4, Fig. 2, looking toward the front.

Like reference characters refer to like parts in the several figures. v The steam boiler furnace shown in the drawings is of the Dutch oven type, A being the boiler, B the reverberatory furnace or fire chamber, and C the casing. thereof. These parts,'except as to the formation of thecasing hereinafter described, may be of ordinary construction and arrangement, the furnace chamber Bt belng located below and in front of the boiler.

The casing 0 comprises the usual outer covering or jacket 0 of steel reinforced with angles, and a fire resisting lining preferably composed of inner and outer layers 0 and c of fire brick and red brick or other suitable material. The boiler, as usual, is slung from overhead beams D supported by upright columns cl at the sides of the casing C.. The hot gases after passing rearwardly through the combustion chamber beneath the boiler, enter theflues of the boiler at the rear end thereof and pass forwardly through these fines to the chimneyconnection E at the front end of the boiler. V a

The casing'has a forward inclined bottom portion F which inclines upwardly and rearwardly, forming an inclined throat or bridge wall, and, back of this, a rear inclined portion G which inclines downwardly toward the rear, the adjacent upper ends of these oppositely inclined portions being connected, preferably by a relatively short horizontal portion-II located somewhat below .the top of the bridge wall. The forward inclined-portion F is connected at its front end to and rises from that portion i of the casing which incloses the furnace or fire chamber Band rests on the supporting foundation, the lower end of, the rear inclined por tion is connected to the rear end portion K of the casing which also rests upon the supporting foundation. As shown in the drawings, there is a relatively" short horizontal portion L connecting the lower end of the rear inclined portion G to therear endportion K. Thus the casing has front and rear endsupporting portions 6 and K which rest on the supporting foundation, and the bottom or barrel of the casing between these supports is of truss-like or arch-like formation and therefore self-supporting.

In steel jacketed casings as heretofore constructed, the bottom of the casing, back of the bridge wall was dependent upon a number of small columns or jacks located beneath the same, or it was hung from supporting girders or beams at the sides of the casing and was made of a curvatureintended to be self-braced. These constructions were not properly shaped and did not accord sufficient space for the complete combustion of the gases and they had no provision for taking care of the ashes and sparks. The described truss-like structure eliminates the necessity for any supports underneath the barrel of the casing and of any side supports therefor, and also results in the taper drop back combustion chamber. The throat and rear supporting portion of the casing, as shown, have upright side walls, while the casing bottom between these parts is preferably of semi-circular or other suitable curvature in cross-section. This transverse curvature further stiffens this part of the casing.

The flames, as they pass the bridge wall, are carried by the draft back through the taper combustion chamber against the back wall of the casing, and the sparks and ashes carried with the flames drop into the ash receptacle M formed by the rear supporting portion K of the casing, where they are out of the draft and in no danger of being carried through the fiues of the boiler into the stack and the gases of combustion in the construction shown pass upwardly in the upright passage shown in the drawings in the rear portion K, to the boiler fiues. The rearwardly increasing depth of the combustion chamber allows the expansion of the gases as they pass rearwardly and results in a more complete combustion thereof and settlingof the sparks and ashes. The rear inclined portion G of the casing also sheds the sparks and ashes settling thereon into the ash receptacle.

A door m in the lower rear part of the casing affords access to the ash receptacle for the-removal of the burnt sparks and ashes.

While the invention is illustrated in the drawings and above described in connection with a single boiler furnace'for the sake of clearness,rit will be manifest that the easing construction is equally applicable to a battery of any desired number of boilers.

I claim as my invention:

1. A metal jacketed steam boiler casing having a front fire chamber portion, and a rear ash receptacle, said front portion and ash receptacle being adapted to rest on a foundation, and a metal jacketed intermediate arch portion adapted to envelop the lower portion of the boiler and having a forward throat part which inclines upwardly toward the rear of the casing and a part in rear of said throat part which inclines downwardly and rearwardly toward said ash receptacle, said forward and rear parts being secured to and supported entirely from said fire chamber and said ash receptacle, and said rear part being adapted to form with a boiler a rear chamber which increases rearwardly in cross section and causes solid matter to be dropped into said ash receptacle from the products of combustion.

2. The combination with a substantially horizontal boiler, of a metal jacketed furnace casing partly enveloping said boiler and comprising a front fire chamber and a rear part, said fire chamber and rear part resting on a supporting foundation, and a metal jacketed and substantially archshaped intermediate portion connected with and supported by said fire chamber and rear part and forming with said boiler a combustion chamber extending lengthwise of the boiler and having a front space decreasing in size toward the rear of said casing and connected with said fire chamber and a rear space increasing in size toward the rear of saidcasing and in which solid matter is removed from the products of combustion passing through said rear space.

3. A metal jacketed steam boiler casing having front and rear supporting portions resting on foundations, said front portion forming a fire chamber and said rear portion containing a passage for the products of combustion, and an intermediate metal jacketed arch shaped portion which is secured to and supported entirely from said front and rear portions and which is lined with fire resisting material, said intermediate portion being adapted to form with the boiler a combustion chamber having a front space increasing in cross section toward the front of the casing and communicating at its front end with the fire chamber, and a rear space increasing in cross section toward the rear of the casing and connected with said passage, whereby solid matter is removed from the products of combustion while passing through said rearwardly increasing part of the combustion chamber.

4:- The combination with a substantially horizontal boiler, of a metal jacketed furnace casing partly enveloping said boiler and comprising a front fire chamber and an ash receptacle at the rear portion of said casing, said fire chamber and ash receptacle resting upon a supporting foundation, and a metal jacketed intermediate portion arranged beneath the boiler and extending lengthwise thereof, said intermediate porminating in said fire chamber and the rear tion being arch-shaped and being connected chamber terminating in said ash receptacle. 10 With and entirely supported from said fire Witness my hand, this 3rd day of Decemchamber and ash receptacle, and forming ber 1913.

With the boiler a chamber having a con- FREDERICK C. STIMMEL. tracted middle portion and front and rear Witnesses:

chambers decreasing in cross section toward T. ONEAL,

said middle portion, the front chamber ter- C. E. JONES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

